Trudy the Calvinist gave me a reading assignment. Herewith a first batch of comments for her and your delectation, discussion, and (presumably inevitable)  disagreement.

In Chapter One, "The Case for God," Sproul distinguishes between four approaches in apologetics: fideism, evidentialism, presuppositionalism, and "the classical school" (4)  He comes out against the first three and nails his colors to the mast of the fourth.

Fideists maintain that there are no rationally compelling arguments for the existence of God, and that we must therefore rely on faith alone.  Sproul mentions Tertullian who opposed Athens (philosophy) to Jerusalem (Abrahamic religion) and famously asked what the latter has to do with the former. He held that Christianity is objectively absurd in the sense of logically contradictory, and that this absurdity was a sort of 'reason' to accept it: credo quia absurdum (I believe because it is absurd.)* Sproul rejects this extreme view on the ground that it amounts to "a serious slander against the character of God and the Holy Spirit, who is the Spirit of truth." (2) Sproul's point is solid. There cannot be self-contradictory truths.  If so, how could the Source of all truth, the Spirit of truth, be self-contradictory?

Evidentialists defend the faith through appeals to biblical history. I am put in mind of what S. Kierkegaard calls "the infinite approximation process" (See Concluding Unscientific Postscript) a process which never arrives at a fixed and final result.  According to Sproul, the most the evidentialist can attain is "a high degree of probability." (2) The probability is high enough, however, to prove the existence of God "beyond a reasonable doubt." Indeed, he thinks the probability sufficient to block  every "moral escape hatch," except one: "You didn't prove it beyond the shadow of a doubt," i.e., the case has not been conclusively made.  This is not good enough for Sproul: he thinks the case for the very specific God of the Christian Bible (presumably with all the Calvinist add-ons) must prove this God beyond even the shadow of a doubt.   

Moreover, Sproul  holds that one can establish the existence of the God in question beyond the shadow of a doubt. which is to say, in a rationally coercive, philosophically dispositive, entirely ineluctable, 'knock-down' way. Apologists of the classical school believe that the case for God can be made "conclusive and compelling." "It is actual proof that leaves people without any excuses whatsoever." (4) Sproul hereby alludes to Romans 1, as becomes clear at the end of the chapter. No excuses, no escape hatches.  You are morally at fault for refusing to accept the God of the Christian Bible!

Presuppositionalists, led by Cornelius van Til, hold that the existence of the God of the Christian Bible can be conclusively established, but to do so, "one must start with the primary premise of the existence of God." (4) One can inescapably conclude that God exists only by presupposing his existence. Sproul's objection is the standard one levelled against the apologetics of the 'presuppers,' namely, that presuppositionalism enshrines  (my word) the informal fallacy of petitio principii, or hysteron proteron if you prefer Greek. In plain English the fallacy is that of circular reasoning.  To put it in my own way: every argument of the form p; therefore p is formally valid in that it is logically impossible for the premise to be true and the conclusion false. But no argument of this form could give anyone a reason to accept the conclusion. Circular arguments, though valid in point of logical form, are probatively worthless.  Sproul goes on to tax Van Til & Co. with the fallacy of equivocation, but Sproul's discussion is rather less than pellucid, so I won't say any more about it; in any case, I agree with him that  presuppositionalism is an apologetic non-starter, as I have argued over many an entry.  (See my Van Til and Presuppositionalism category.)

Classical apologists such as Sproul and presuppositionalists both assert that without God there is and can be no rationality. The difference is that classicists  insist that the existence of God cannot be merely presupposed, but must be proven in a non-circular or "linear" (Sproul) way.  They also insist that it can be proven conclusively, and thus in such a way as to render the existence of God objectively certain.  As I read Sproul, he is telling us that we can know with objective certainty, and thus without the possibility of mistake, that the God of the Christian Bible exists.  In the later chapters of his book he lays out the proof.

Critique

So much for exposition. Where do I stand? I reject all four positions, as above formulated. My current position, tentatively and critically held, is however closer to fideism than to the other three. Call it moderate fideism to distinguish it from the Tertullianic and Kierkegaardian extremes. It is moderately fideistic in that it rejects the anti-fideism of the presuppositionalists and that of the classicists.

Readers of this weblog know that I have maintained time and again that one can both reasonably affirm and reasonably deny the existence of God.  That is to say: there are no rationally coercive arguments either way. Nothing counts as a proof sensu stricto unless it is rationally coercive. So there are no proofs either way. An argument can be good without being rationally coercive, and there are good arguments on both sides. There are also bad arguments on both sides.  The quinque viae of the doctor angelicus  are good arguments for the existence of God, but  in my view not rationally compelling, coercive, dispositive, ineluctable — pick your favorite word.  They don't settle the matter, once and for all. But the same holds for some of the atheist arguments, some of the arguments from evil, for example.  Galen Strawson is the polar opposite of Sproul on the God question. So to savor (bemoan?) the extremity of the worldview polarization, take a look at my critique of Strawson at Substack.

So am I taking the side of Tertullian and Kierkegaard? No way. They go to the opposite extreme to that of Sproul (although he is not as extreme as the 'presuppers').  I am a fair and balanced kind of guy.

I say that the belief that God exists is a matter of faith.  Faith is not knowledge, but it is not entirely opposed to it either, as it is for Tertullian and Kierkegaard who hold that belief in the God of the Christian Bible, God Incarnate, is logically absurd, and yet is to be maintained, for S. K. anyway, by infinite subjective passion.  On the contrary, I say that one ought not believe anything that is demonstrably absurd (logically contradictory), and that to do so is a plain violation of the ethics of belief.  (If you subscribe to an ethics of belief, then you must also be a limited doxastic voluntarist, and I am.) Faith does not and cannot contradict reason; it supplements it. Faith is on the way to knowledge  and seeks its fulfillment in it.  Faith is inferior to knowledge as a route to reality, as Aquinas would agree. Faith extends our grasp of reality — our contact with it — beyond what we can know, strictly speaking, except that there are and can be no internal assurances of veridicality here below: the verification, if it comes at all, will come after we have quit these bodies.

Faith is neither blind nor seeing. It is neither irrational nor rational, but suprarational. It goes beyond reason without going against reason. 1 Corinthians 13:12 may provide a clue:  ^"For now we see through a glass, darkly; but then face to face: now I know in part; but then shall I know even as also I am known." (KJV)  Paul is suggesting that we see all right; we are not blind. But the seeing is obscure at present and will culminate in luminosity.  Cognitio fidei is not cognition strictly speaking, but it is not blind either. We could liken it to a dim and troubled sighting in the fog.  Pace Kierkegaard, not a desperate leap, but  a hopeful reaching out beyond the bounds of the certain. 

Sproul thinks he can prove the existence of God by reason alone. In my next installment I will show that he fails in this endeavor.

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*Nietzsche quipped that Tertullian should have said credo quia absurdus sum, "I believe because I am absurd."